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Regional Rainfall Depth–Duration–Frequency Equations for an Alpine Region


  • Marco Borga


  • Claudia Vezzani
  • Giancarlo Fontana


In this paper the scaling hypotheses are applied to annual maximum series of rainfall depth for different rainfall duration to derive the depth–duration–frequency (DDF) curve. It is shown that, based on the empirically observed scaling properties of rainfall and some general assumptions about the cumulative distribution function for the annual maximum of the rainfall depth, it is possible to derive a simple DDF relationship. This general framework provides a basis for the generation of maps that can be used to infer DDF curves at any point of a particular area. Data from a dense raingauge network in a mountainous region in north-eastern Italy (the Trentino Province) are used to clarify the methodology for the construction and regionalization of the DDF relationship. The geographical variation of short-duration (i.e., less than 60 xmin) rainfall extremes is also evaluated by using the same framework. It is found that depth–duration ratios, defined as the ratios of the t-min to the 60-min rainfall depths of the same return period, may be considered independent of return period and geographical location for any storm duration less than 60 min. Copyright Springer 2005

Suggested Citation

  • Marco Borga & Claudia Vezzani & Giancarlo Fontana, 2005. "Regional Rainfall Depth–Duration–Frequency Equations for an Alpine Region," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 36(1), pages 221-235, September.
  • Handle: RePEc:spr:nathaz:v:36:y:2005:i:1:p:221-235
    DOI: 10.1007/s11069-004-4550-y

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    Cited by:

    1. Mohit Prakash Mohanty & Mazhuvanchery Avarachen Sherly & Subhankar Karmakar & Subimal Ghosh, 2018. "Regionalized Design Rainfall Estimation: an Appraisal of Inundation Mapping for Flood Management Under Data-Scarce Situations," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 32(14), pages 4725-4746, November.


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